The timeouts are, somehow, gone. There's now a perma-orange: http://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://queue.taskcluster.net/v1/task/WUvZtBT1TMuf84CLFL3SQw/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1 There is a one pixel difference in the vertical position of the second line of text in the test case. The weird thing is that it only happens on mulet builds, not on browser builds for the same changeset.
This is already annotated with "skip-if((B2G&&browserIsRemote)||Mulet)", so I don't know why this is running. It should be fails-if(Mulet) if not intermittent. I wonder whether Mulet and browser builds use different fonts.
The problem is that the reftest harness doesn't handle multiple things correctly (bug 720684). Fixed in https://hg.mozilla.org/integration/mozilla-inbound/rev/f37c01f7c064